School of Geography and Tourism, Guizhou Education University, Guiyang, 550018, China.
Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, 130102, China.
Sci Rep. 2017 Mar 7;7(1):108. doi: 10.1038/s41598-017-00218-4.
Warming of the climate system is unequivocal, that is, stronger warming during night-time than during daytime. Here we focus on how soil nematodes respond to the current asymmetric warming. A field infrared heating experiment was performed in the western of the Songnen Plain, Northeast China. Three warming modes, i.e. daytime warming, night-time warming and diurnal warming, were taken to perform the asymmetric warming condition. Our results showed that the daytime and diurnal warming treatment significantly decreased soil nematodes density, and night-time warming treatment marginally affected the density. The response of bacterivorous nematode and fungivorous nematode to experimental warming showed the same trend with the total density. Redundancy analysis revealed an opposite effect of soil moisture and soil temperature, and the most important of soil moisture and temperature in night-time among the measured environment factors, affecting soil nematode community. Our findings suggested that daily minimum temperature and warming induced drying are most important factors affecting soil nematode community under the current global asymmetric warming.
气候系统变暖是明确无疑的，即夜间升温比白天更强。在这里，我们关注的是土壤线虫如何应对当前的非对称变暖。在中国东北松嫩平原西部进行了野外红外加热实验。采用日间加热、夜间加热和昼夜加热三种加热方式来模拟非对称变暖条件。我们的结果表明，日间和昼夜加热处理显著降低了土壤线虫密度，而夜间加热处理则略微影响了密度。食细菌线虫和食真菌线虫对实验加热的响应与总密度表现出相同的趋势。冗余分析显示土壤湿度和土壤温度的作用相反，在测量的环境因素中，夜间土壤湿度和温度最重要，影响土壤线虫群落。我们的研究结果表明，在当前全球非对称变暖下，日最低温度和变暖引起的干燥是影响土壤线虫群落的最重要因素。
